26. Surgery Versus Splints A study compared surgery and splinting for subjects suffering from carpal tunnel syndrome. It was found that among 73 patients treated with surgery, there was a 92% success rate. Among 83 patients treated with splints, there was a 72% success rate. Calculations using those results showed that if there really is no difference in success rates between surgery and splints, then there is about 1 chance in 1000 of getting success rates like the ones obtained in this study.
A. Should we conclude that surgery is better than splints for the treatment of carpal tunnel syndrome? Yes, surgery is better than splints.
B. Does the result have statistical significance? Why or why not? Yes, it shows the rate of success was higher for surgery than splints.
C. Does the result have practical significance? Yes, it would be a better investment to proceed with the surgery instead of the splint.
D. Should surgery be the recommended treatment for carpal tunnel syndrome? Yes.
30. Cloning Survey A Gallup poll of 1012 randomly surveyed adults found that 9% of them said cloning of humans be allowed.
A. Sample – 1012
B. Population – Adults
C. Yes, sample is likely to be representative of the population.
18. Bad Question The author surveyed students with this request: “Enter your height in inches.” Identify two major problems with this request.
Problem 1: The measurements may be inaccurate
Problem 2: People might find the units confusing, or be biased.
8. Testing Echinacea A study of effectiveness of Echinacea involved 707 cases of upper respiratory tract infections. Children with 337 of the infections were given Echinacea, and children with 370 of the infections were given placebos.
The description corresponds to an experiment.
18. Curriculum Planning In a study of college programs, 820 students are randomly selected from those majoring in communications, 1463 student are randomly selected from those majoring business, and 760